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The Psychopathy Checklist (PCL) and the slightly revised Psychopathy Checklist (PCL-R) represent an alternate conceptualization to the antisocial personality disorder formulation of antisociality. The PCL and PCL-R have been found to have high reliability and good predictive validity in prisoner populations. Thus far, almost all published work has been based on prisoners. This study examined the 1-month test-retest reliability of the PCL-R in 88 methadone-maintained male patients as well as the effects of increased information (interview, clinical chart review, partial and complete criminal records) on PCL-R scores and on two diagnostic derivations of the PCL-R. PCL-R scores and diagnostic proportions were not found to differ significantly between baseline and 1 month
Alterman et al. (Wed,) studied this question.